It seems to me that an unspoken assumption in this thread is that "design" is purely theoretical work, performed by a designer. If the behavior of a sleep-depr

It seems to me that an unspoken assumption in this thread is that "design" is purely theoretical work, performed by a designer. If the behavior of a sleep-deprived sailor is an unknown variable, then the obvious solution is to get a sleep-deprived sailor involved in the design process. This is not particularly complex, and while _some_ money is involved, preventing this accident would basically give you a budget of $223 million, human lives not even taken into account.